A Twist drill is a drill bit that has a Helical ( screw shaped ) flute cut into it for good swarf removal. It looks like a straight fluted drill bit has been twisted , hence the name.
A stepped drill is a special drill bit generally used to drill thin sections of a material. It is characterized by a series of increasing diameter cutting section which are stepped to specific diameters, allowing the user to drill to whatever diameter they need without having to drill a pilot hole and then change bits to work up to the required diameter of hole. It has a stepped conical profile.
A Burnishing drill generally has straight flutes and multiple stabilizing margin edges with a thinner pilot section at the tip that is followed by an extra set of burnishing margins . This allows very accurate sizing of the hole and the burnishing margins create a very fine finish on the inside of the hole. These drills are extremely precise when you need multiple holes that are very close in size to each other as they tend to be more rigid and do not deform under load like twist drills do.
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